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DrAllis 
Orange Level Access
Joined: 12 Sep 2009
Points: 23484
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 Posted: 26 Jun 2026 at 8:12am |
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I sure wouldn't use blue RTV. I believe the gold color is the highest temp type.
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Les Kerf
Orange Level
Joined: 08 May 2020
Location: Idaho
Points: 1891
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Posted: 26 Jun 2026 at 2:03pm |
 DrAllis wrote:
I sure wouldn't use blue RTV. I believe the gold color is the highest temp type. |
Yup. And make sure the surfaces are flat
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Oldwrench
Bronze Level
Joined: 12 Jan 2020
Location: Northeast
Points: 174
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Posted: 08 Jul 2026 at 5:27pm |
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Just as a follow up, torquing the manifold nuts did finally settle down after about 6 cycles of heating/cooling. I had extra gaskets, since I bought 2 sets. For fun, I heated one with a propane torch - not a direct flame, just some decent heat. It flamed, became brittle and disintegrated almost immediately. The material looked to be the same as the carburetor gasket, and to me looks and feels like regular gasket material. So I have zero confidence that these gaskets will hold up for any length of time. I couldn't find any alternate gaskets anywhere. They are encased by the steel cups, so that may help. We'll see. Anyways, with anti-seize on the brass nuts, I don't expect any trouble if the gaskets fail and I need to install new ones. Maybe I should keep an eye out for a thin sheet of kevlar or asbestos and cut my own!
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DrAllis
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Joined: 12 Sep 2009
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Posted: 08 Jul 2026 at 6:07pm |
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I've thought about making a copper gasket to fit inside the metal holders.
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8070nc
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Joined: 21 Mar 2019
Location: North Carolina
Points: 898
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Posted: 08 Jul 2026 at 6:21pm |
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Doc im glad you said that. I did that on a perkins in a 706 forklift. Its got precombustion chambers with caps outside the head. One had blown out the gasket and whooever had it before me didnt fix it and it wore the surface on the cap. I got a piece of .050 thick copper and made a gasket. It had enough squish that it fixed it
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1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor
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Alex09(WI)
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Joined: 15 Mar 2012
Location: CECIL WI
Points: 1792
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Posted: 08 Jul 2026 at 7:28pm |
Oldwrench wrote:
No one could give me a straight answer on why there are double gaskets.
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LOL See my reply above!
Definitely recommend a thin bead of highest temp orange/red/gold rtv in between each layer of the "sandwich" and on the manifold and cylinder head. This will hold the gaskets in place on assembly and fill in the minuscule imperfections in the steel surfaces.
Retorque until the nuts hold the torque is the most important part and leads to premature failure of the gaskets if not done!!
The OEM thicker "exhaust type" gaskets are available at A&W Tractor and are more expensive.
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www.awtractor.com
A&W TRACTOR 920-598-1287
KEEPING ALLIS-CHALMERS IN THE FIELDS THROUGH THE 21ST CENTURY
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Oldwrench
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Joined: 12 Jan 2020
Location: Northeast
Points: 174
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Posted: 09 Jul 2026 at 7:18am |
Alex, in hindsight I should have contacted you to see if better gaskets were available, since you always seem to have NOS or higher quality items available. In the middle of a project I just wanted to get done though, I went ahead with what I had. Given the junky material, I didn't see how doubling the gaskets would add any strength.
I like Doc's idea of copper gaskets. Now that I'm looking around, it would be fairly easy to find simple copper sealing washers with dimensions fitting the manifold ports. The front and rear ports would be a bit more difficult. A custom copper gasket would seem feasible ( https://coppergaskets.us/shop ), but not sure of the cost for a one-off. Anyway, I'll let everyone know how these gaskets last - hopefully at least several years.
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Clay
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Joined: 11 Sep 2009
Location: Udall, Kansas
Points: 10716
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Posted: 09 Jul 2026 at 7:33am |
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A "no-blow exhaust gasket" used on an aircraft engine is something I have though about.
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Allis dave
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Joined: 10 May 2012
Location: Northern IN
Points: 3168
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Posted: 09 Jul 2026 at 10:18am |
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I ouwldn't worry too much. If the head of manifold are true they should seal up and stay a long time. There have been a lot of WD, WD45's and D17's put together with these new gaskets.
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